A suspect in the murder of Wolf has the last name Verdugo. Verdugo actually means executioner in Spanish.
Max Greenfield (David Nicolaides) and Julie Gonzalo (Madison Queller) were both series regulars on Veronica Mars (2004).
Madison says of Beckett, "I can't believe the biggest scofflaw at Stuy became a cop." Scofflaw means a contemptuous law violator.
The night castle and Beckett are both on dates (with separate people) they both wear purple. Beckett, her shirt with matching eyeshadow and Castle, his shirt.